摘要：

以二乙二醇丁醚（DGBE）为唯一碳源，采用阶段性提荷的方式，对好氧活性污泥进行培养驯化，考察好氧活性污泥法对DGBE模拟废水的降解效果和耐受浓度，并对其降解动力学进行分析。实验结果表明：以农药生产废水处理工艺的好氧段污泥进行接种，DGBE进水COD为600~700 mg/L，驯化初期微生物可较快适应DGBE模拟废水。随后以200 mg/L的理论COD提升进水负荷，在一定浓度条件下COD去除率均可达90%~95%，整体降解效果较好。当进水DGBE质量浓度低于620 mg/L时，DGBE可在5~6 h内完全降解，之后随着进水DGBE质量浓度的升高，降解时间逐渐延长。在该实验条件下，好氧活性污泥对DGBE的最高耐受质量浓度在1 103 mg/L左右，继续提高进水DGBE，好氧活性污泥的降解效果及状态均变差，并出现COD降解迟滞期。活性污泥对DGBE的降解符合一级动力学特征，DGBE及COD的降解速率随浓度的上升均呈先快后慢的趋势，说明高浓度的DGBE对微生物具有抑制作用。

关键词: 二乙二醇丁醚, 好氧生物降解, 光伏废水

Abstract:

Using diethylene glycol butyl ether（DGBE） as the only carbon source， the aerobic activated sludge was cultivated and acclimated by phasing up the load. The degradation effectiveness and tolerance concentrations of the aerobic activated sludge method on DGBE simulated wastewater were examined and the degradation kinetics were analysed. The experimental results showed that the aerobic sludge of pesticide production wastewater process was used for inoculation， influent COD was 600-700 mg/L， and the microorganisms could adapt to the DGBE simulated wastewater quickly at the early stage of acclimatization. Subsequently， the influent load was increased with a theoretical COD of 200 mg/L， and the overall degradation effect was good as the COD removal rate could reach 90%-95% under certain concentration conditions. When the influent DGBE mass concentration was below 620 mg/L， DGBE could be completely degraded within 5-6 hours. After that， the degradation time was gradually extended as the influent DGBE mass concentration increased. Under the experimental condition， the maximum tolerated mass concentration of aerobic activated sludge to DGBE was around 1 103 mg/L. Continuing to increase the influent DGBE， the degradation effect and state of aerobic activated sludge became worse and a lag period of COD degradation appeared. The degradation of DGBE by activated sludge was in accordance with the first-order kinetics， and the degradation rate of DGBE and COD showed a trend of fast and then slow with the increase of concentration， indicating that high concentration of DGBE had an inhibitory effect on microorganisms.

Key words: diethylene glycol butyl ether, aerobic biodegradation, photovoltaic wastewater

中图分类号: 

• X52